Thanks for the link. The remaining of us still playing TMO from time to time would love to see master server being functional again though.
I've contacted Hylis via discord a few months ago and he said it's all fine on your side, yet still me and some other people can't connect to play online.
Master servers in TMO Demo, TMSX and TMSX Demo work just fine

I updated PCGamingWiki to include instructions on how to improve the compatibility of TMO (TrackMania Original) for newer operating systems. All you need is to update the game to not include StarForce. If you do get a white screen after that when starting the game, you will need to apply a DirectX wrapper in order for the game to render properly.